. >> europe in her state building shooting or a man killed another man in front of the empire state building months ago. nine people were injured near the empire state building. all of them were injured by police when they unloaded 16 rounds in the shadow of the empire state building after a disgruntled former apparel designer, killing at to engage in a gunbattle with police. paul barrett, and coulter said, only one policy is ever been tried to deter mass murder -- concealed carry laws. >> i don't know what she means by only one policy has been shown. i don't know what social science she is pointing to. the hard truth for people on both sides of this debate is the social science is inconclusive. the best studies that have been done on the proliferation of separatearry laws image anyone who wants to conceal-carry license can have one. the best research has been done at yale university that says, quite candidly, we can not tell. we cannot find a good association between the liberalization of those laws, the fact it is easier to carry guns concealed a public, that it was 25 years ago and crime